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Topic Review (Newest First)

10-17-2012 02:33 PM

nascaracing17

i believe its 75-90

10-10-2012 06:16 PM

blackonblacksvt03

Quote:

Originally Posted by BigRed03

"API viscosity ratings for gear oils are not directly comparable with those for motor oil, and they are thinner than the figures suggest. For example, many modern gearboxes use a 75W90 gear oil, which is actually of equivalent viscosity to a 10W40 motor oil."

My bike takes 10w-40 and i KNOW that its at least half as thin as 75W140 from dealing with both more times than i would care to count, same goes as merc 5 its water compareed to 10W40. Ford to my understanding does not run 75w90 in ANYTHING anymore, all the manuals are more of a "automatic tranny fluild" than a gear oil because of the tolerances being alot tighter than a 1967 ford f150, even the rear diffs are not 75W90 they are mostly 75W140

10-10-2012 06:09 PM

blackonblacksvt03

Quote:

Originally Posted by BigRed03

if you read the FJ link, there is a lengthy discussion on this. Amsoil and RP recommend 10w40 for the getrag.

no offense dude of course they do, they sell it

10-10-2012 11:12 AM

BigRed03

if you read the FJ link, there is a lengthy discussion on this. Amsoil and RP recommend 10w40 for the getrag.

10-10-2012 10:59 AM

limeyrider

Quote:

Originally Posted by BigRed03

"API viscosity ratings for gear oils are not directly comparable with those for motor oil, and they are thinner than the figures suggest. For example, many modern gearboxes use a 75W90 gear oil, which is actually of equivalent viscosity to a 10W40 motor oil."

Several instances around this forum, people use a specifically designed 5 or 10W40 oil from Europe in the getrag for racing. Since mines a DD, I use the ford honey.

When I worked in Germany, 10W-40 THERE was the same viscosity as 10W-40 in North America. Like I said, I have no idea where you get that information. cSt measurements are not 'custom made' to any fluid, they are a standardized measurement...

The Amsoil data support exactly what my point is. Motor oil is not even close to GL-4 lubricant. I think there are maybe three or four of us on this entire forum who can interpret what the spec sheets tell us. I don't mean anything as a personal attack but you're posting information that contradicts your hypothesis.

10-10-2012 10:46 AM

limeyrider

cSt - Centi-stroke has nothing to do with API's own version of oil 'weight.' cSt is a standardized measurement regardless of the fluid being measured or what organization does the measuring.

Quote:

Originally Posted by BigRed03

"API viscosity ratings for gear oils are not directly comparable with those for motor oil, and they are thinner than the figures suggest. For example, many modern gearboxes use a 75W90 gear oil, which is actually of equivalent viscosity to a 10W40 motor oil."

"API viscosity ratings for gear oils are not directly comparable with those for motor oil, and they are thinner than the figures suggest. For example, many modern gearboxes use a 75W90 gear oil, which is actually of equivalent viscosity to a 10W40 motor oil."

Several instances around this forum, people use a specifically designed oil from Europe in the getrag, with the 5w and 10w40 euro spec oil (which is for motorcycles) which is used in both the engine AND transmission. Since mines a DD, I use the ford honey.